Design and fabrication of a 315 μΗ bondwire micro-transformer for ultra-low voltage energy harvesting

This paper presents a design study of a new topology for miniaturized bondwire transformers fabricated and assembled with standard IC bonding wires and toroidal ferrite (Fair-Rite 5975000801) as a magnetic core. The microtransformer realized on a PCB substrate, enables the build of magnetics on-top-...

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Bibliographic Details
Published in2014 Design, Automation & Test in Europe Conference & Exhibition (DATE) pp. 1 - 4
Main Authors Macrelli, Enrico, Wang, Ningning, Roy, Saibal, Hayes, Michael, Paganelli, Rudi Paolo, Tartagni, Marco, Romani, Aldo
Format Conference Proceeding
LanguageEnglish
Published EDAA 01.03.2014
Subjects
Bonding
bonding wires
bondwire
converter
DC-DC
energy harvesting
ferrite
Ferrites
Layout
magnetics
on-chip
PCB
Toroidal magnetic fields
transformer
Transformer cores
Wires
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Summary:This paper presents a design study of a new topology for miniaturized bondwire transformers fabricated and assembled with standard IC bonding wires and toroidal ferrite (Fair-Rite 5975000801) as a magnetic core. The microtransformer realized on a PCB substrate, enables the build of magnetics on-top-of-chip, thus leading to the design of high power density components. Impedance measurements in a frequency range between 100 kHz to 5 MHz, show that the secondary self-inductance is enhanced from 0.3 μH with an epoxy core to 315 μH with the ferrite core. Moreover, the micro-machined ferrite improves the coupling coefficient from 0.1 to 0.9 and increases the effective turns ratio from 0.5 to 35. Finally, a low-voltage IC DC-DC converter solution, with the transformer mounted on-top, is proposed for energy harvesting applications.
ISSN:1530-1591
1558-1101
DOI:10.7873/DATE.2014.155